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ving its properties. Epicycloidal wheel, a device for producing straight-line motion from circular motion, on the principle that a pin fastened in the periphery of a gear wheel will describe a straight line when the wheel rolls around inside a fixed internal gear of twice its diameter.

A circular opening to recive a hook, cord, ring, or rope; an eyelet.

), a mole cricket. -- Fan light (Arch.), a window over a door; -- so called from the semicircular form and radiating sash bars of those windows which are set in the circular heads of arched doorways. -- Fan shell (Zoöl.), any shell of the family Pectinidæ. See Scallop, n., 1. -- Fan tracery (Arch.), the decorative t…

A horizontal vane revolving over the surface of wort in a cooler, to produce a circular current in the liquor. Knight.

ith an artificial fly. -- Fly leaf, an unprinted leaf at the beginning or end of a book, circular, programme, etc. -- Fly maggot, a maggot bred from the egg of a fly. Ray. -- Fly net, a screen to exclude insects. -- Fly nut (Mach.), a nut with wings; a thumb nut; a finger nut. -- Fly orchis (Bot.), a plant (Ophrys…

ting upon the sea, and resembling distant land. -- Fog ring, a bank of fog arranged in a circular form, -- often seen on the coast of Newfoundland.

ckle. -- French horn, a metallic wind instrument, consisting of a long tube twisted into circular folds and gradually expanding from the mouthpiece to the end at which the sound issues; -- called in France cor de chasse. -- French leave, an informal, hasty, or secret departure; esp., the leaving a place without payin…

e temperature in degrees of the air thermometer, reckoned from its zero of expansion. -- Circular functions. See Inverse trigonometrical functions (below). -- Continuous function, a quantity that has no interruption in the continuity of its real values, as the variable changes between any specified limits. -- Discon…

A genus of simple, stony corals; -- so called because they are usually flat and circular, with radiating plates, like the gills of a mushroom. Some of them are eighteen inches in diameter.

on the arc of a great circle, or so as to make the shortest distance between two places; circular sailing.

cluster, usually nine in number, of small iron balls, put together by means of cast-iron circular plates at top and bottom, with two rings, and a central connecting rod, in order to be used as a charge for a cannon. Formerly grapeshot were inclosed in canvas bags.

A flat, circular stone, revolving on an axle, for grinding or sharpening tools, or shaping or smoothing objects. To hold, pat, or bring one's nose to the grindstone, to oppress one; to keep one in a condition of servitude. They might be ashamed, for lack of courage, to suffer the Lacedæmonians to hold their noses to th…

rm of two or more bands or strings twisted over each other in a continued series, leaving circular openings which are filled with round ornaments.

Moving in a circular path or way; whirling; gyratory.

Winding or coiled round; curved into a circle; taking a circular course.

The act of turning or whirling, as around a fixed center; a circular or spiral motion; motion about an axis; rotation; revolution. The gyrations of an ascending balloon. De Quincey. If a burning coal be nimbly moved round in a circle, with gyrations continually repeated, the whole circle will appear like fire. Sir I. N…

A circular motion, or a circle described by a moving body; a turn or revolution; a circuit. Quick and more quick he spins in giddy gyres. Dryden. Still expanding and ascending gyres. Mrs. Browning.

Turning the plane of polarization circularly or spirally to the right or left.

the ordinary price; or a price much reduced. -- Half round. (a) (Arch.) A molding of semicircular section. (b) (Mech.) Having one side flat and the other rounded; -- said of a file. -- Half shift (Mus.), a position of the hand, between the open position and the first shift, in playing on the violin and kindred instru…

A semicircular place, as a semicircular arena, or room, or part of a room. The collections will be displayed in the hemicycle of the central pavilion. London Academy.